/skaɪ ||; skaɪ/noun [C] [usu.sing] [U] (plural skies) the space that you can see when you look up from the earth, and where you can see the sun, moon and stars 天；天空: a cloudless/clear blue sky 万里无云╱晴朗的蓝天I saw a bit of blue sky between the clouds. 我看到云缝间一小片蓝天。I saw a plane high up in the sky. 我看见高空有一架飞机。